ISC2 Certified Cloud Security Professional (CCSP) Practice Question
During the request for proposal for a new private cloud data center, your company specifies that its ecommerce platform must stay online even when facility operators perform scheduled maintenance on power or cooling equipment. The facility must implement at least N+1 redundancy for all critical capacity components and the contract must guarantee 72 hours of on-site fuel storage for the backup generators. To meet these requirements while avoiding unnecessary cost, which minimum Uptime Institute tier rating should you require from the colocation provider?
Tier III - Concurrently Maintainable Site Infrastructure
Tier III facilities are classified by Uptime Institute as "Concurrently Maintainable," meaning any single critical power, cooling, or distribution component can be taken out of service for planned maintenance without impacting IT operations. Tier III also requires an N+1 configuration for those critical systems. Although the Tier Standard mandates only 12 hours of on-site fuel, operators may provision more capacity-as requested here-without affecting the Tier classification. Tier II does not allow concurrent maintenance, and Tier I offers no redundancy. Tier IV would satisfy the requirements but adds costly 2N+1 fault-tolerant infrastructure that the business does not need, so Tier III is the minimum appropriate choice.
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ISC2 Certified Cloud Security Professional (CCSP)
Cloud Platform & Infrastructure Security
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